// for js isDate function
var dtCh= "-";
var minYear=1900;
var maxYear=2100;

function jsonload(fs_onload,fs_param)
{
  switch(fs_onload)
  {
    case 'popup':
    window.open('/doc/popup/popup.asp?id='+fs_param,'Timpaan','scrollbars=yes,resizable=no,width=480,height=440,left=25,top=100');
    break;
    case 'popup_tuinkamer':
    window.open('doc/static/tvh/popup_maashaven.htm','popup','scrollbars=no,resizable=no,width=480,height=440,left=25,top=100');
    break;
  }
}

function isvalidemail(fs_emailaddress,fs_emptyallowed)
{
  var lb_valid;
  if(fs_emptyallowed==1&&fs_emailaddress=='')
    lb_valid=true;
  else
    lb_valid=false;
  if(fs_emailaddress!='')
  {
    re = /^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
    if(re.test(fs_emailaddress))
    {
      lb_valid=true;
    }
  }
  return(lb_valid);
}

function isnumeric(supposedly_numeric_variable,fs_emptyallowed)
{
 	var lv_count,lb_isnumeric=true;
 	allowed='0123456789';
 	if(supposedly_numeric_variable=='')
 	{
   	if(fs_emptyallowed!=1)
     	lb_isnumeric=false;
 	}
 	else
 	{
   	for (lv_count=0;lv_count<supposedly_numeric_variable.length;lv_count++)
   	{
     	if (allowed.indexOf(supposedly_numeric_variable.charAt(lv_count)) == -1)
     	{
       	lb_isnumeric=false;
     	}
   	}
 	}
 	return(lb_isnumeric);
}

function actnav(src)
{
  src.style.cursor='hand';
  src.className='td_nav2';
}

function pasnav(src)
{
  src.style.cursor='default';
  src.className='td_nav1';
}

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr,fv_EmptyAllowed)
{
	if(dtStr==''&&fv_EmptyAllowed==1)
	  return true;
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strDay=dtStr.substring(0,pos1)
	var strMonth=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		return false
	}
  return true
}